About this replacement
Lenovo IdeaPad Y480 Series — 11.1V Li-ion Replacement Battery (L11L6F01)
This 11.1V, 4400mAh Li-ion battery replaces the original cell in the Lenovo IdeaPad Y480, Y480A, Y480M, and Y480N. It covers a wide range of OEM part numbers including L11L6F01, L11S6Y01, 45N1042, and 0A36311. Voltage and capacity match the stock specification exactly.
- Y480 series compatibility: The Y480 family shares a common 11.1V battery rail, connector pinout, and BMS handshake across the Y480, Y480A, Y480M, and Y480N variants. One cell fits all four without any adapter or modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Y480 platform. The BMS communicated correctly with the EC, charge current tapered normally at capacity, and the protection circuit tripped cleanly at the low-voltage threshold — no anomalous cutoffs recorded.
- First-cycle calibration on the Y480: After installing, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on the first boot with a new cell.
Why the IdeaPad Y480 shuts down at 20–30% after a battery swap
The Y480's fuel gauge IC calibrated its discharge curve against the old cell's degraded chemistry. With a new cell installed, those stored values no longer match the actual voltage-to-capacity relationship. Under full CPU and display load, the new cell briefly sags below the threshold the EC was expecting, triggering an emergency shutdown even though real charge remains. Running two or three full discharge-to-hibernate cycles allows the fuel gauge IC to re-map the curve against the new cell and eliminates the premature cutoff.
BIOS reporting battery health as "poor" immediately after fitting a new cell
The BIOS reads health data from the battery's EEPROM, which carries cycle count and wear flags written by the previous cell's BMS. A fresh cell physically arrives with no wear, but the BIOS sees the carried-over EEPROM state and flags it as degraded. This is a data mismatch, not a battery fault. Complete one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — the BIOS battery learn cycle overwrites the stale EEPROM read and the health indicator resets to normal.